Blowtorch



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1923. v J. B. ANDERSON BLOWTORCH Filed Sept. 28

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Patented lt'llay 2.29, 1223.

JAMES B. ANDERSON, OF PITTSBURGH, PENNSYLVANI, ASSIGNOR TO UlJPLESS FENNSYLVANIA.

BLOVJ'TOECH.

Application filed September 28, 1921. Serial No. 503,338.

T0 all whom t may concern Be it known that l, JAMES B. Anpassen, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Elowtorches, of which the following is a specification.

This invention relates to blow-torches and more especially to torches adapted for the use of liquefied gas as fuel.

One of the main objects of the invention. is to provide a torch in which fuel in either gaseous or liquid form may be used, as desired. A. further object is to provide a torch in which the possibility of the clogging of the burners has been reduced to a minimum, if not entirely eliminated Still another object is to provide a torch having simple andV efficient means to regulate the feed of the fuel in either liquid or gaseous state. A further objectI is to provide a torch of simple design and construction and which can be manufactured at low cost. Further objects and advantages will also appear from the specification and drawings which form a part of this application.

The present applicationis to cover ini-- `provements over the construction indicated in Patent No. 1,364,972. June 117 1921, and the Patents Nos. 1,390,264 and 1,390,265 issued on September 13, 1921, to Charles ll. Allen and myself,

Referring to the drawings Fig. 1 is a central vertical sectional view through a torch constructed in accordance with. myv invention. Y

Fig. 2v is a rear elevation of the standard and associated parts, with the extreme parts broken off.

Fig. 3 is an enlarged fragmental sectional view through a burner used in my torch.

Fig. 4 is an end view corresponding to Fig. 3.

5 is an enlarged sectional view through the casing of the filling valve used Fig. 10 is a top plan view .of Figure 9.

Referring to Figures 1 and 2, the tank 1, made of steel, copper or any other suitable material, is provided with an opening at the center of its top into which the centrally threaded collar 2 is secured in any suitable leak-proof manner. A standard 3, terminating at its lower end with the threaded shank 4 is secured in said collar. ln the shank of said standard are drilled to the required depth four ducts; duc-ts 5A and 6 leading respectively to a test valve .7 and a safety valve 8; the ducts 9 and 10 being respectively the liquid fuel and'gaseous fuel ducts,l which are governed by their corresponding valves 11 and 12. The ducts 9 and 10 can be pnt in communication with the main fuel duct 13, drilled in the upper part of the standard, by the short connecting ducts 14 and 15 and through the proper maniplation of the valves 11 and 12. In the liquid fuel duct 9 is secured a bent tube 16 reaching close to the bottom of the tank and having` at its lower end a strainer 1T made of fine wire mesh to prevent the entrance within the liquid fuel duct of any foreign matter which might be present in the fuel. rlhe tank is provided with the concave bottomv 1S at the center of which is securely mounted or brazed the collar 19 which is centrally threaded to receive the hollow valve casing 20, an enlarged view which is shown in Figure 5. This casing consists of a polygonal flange 21, on both sides of which are the threaded shanks 22 and 23. The upper shank 22 engages the collar 19 and is provided with 'the sleeve extension 24 properly finished interiorly to act as a cage for the cylindrical filling valve 25, in the bottom of which is inserted a disc 26 of any suitable and preferred soft metal to insure a lealcproof contact with the seat 27 provided in the casing. rThe movement of the filling valve 25 is limited and guided againstrotation within the sleeve 24 by a pin 28, conveniently secured in the sleeve and engaging a slot 29 cut in the valve. Adjacent the bottom of the sleeve 24 ll provide therein the apertures 30 to allow the passage of the liquid when filling the tank. The casing is closed at the bottom by means of a threaded wing cap 31; it being noted that the depression in the concave bottom 18 is such that the wing cap will not extend beyond theI lower edge of'. the tank.

The test valve 7 is used to indicate the presence of-\fuel"y in :thel tank.` The yshank of.I this valve ris `threaded and terminates with a point which engages the suitably formed aperture 32, which is outwardly enlarged to provide a passage? for the fuel and allow yits escape through the small holes 33, when the valve is opened. A. tube 84, the lowery "Mti-'ally therethrough" and" terminating with andlis provided Eat the center with a small lthalateral apertures 37.' A thin'disc or diaphragm is inserted between the cap `andffthe-end'of the 'nipple 39; the thickness oftsaiddiaphragm being calibrated to secure" then tearing thereof when a certain pressurefwithin thetank is exceeded.

My blow-torch is provided with a main bur-ner`40 and' thepilot burner 41y which are severallysuppliedwith fuelby the main duct 13."y Each-of said 'burners is composedV of the `inter-iorlythreaded cap 42 providedv with a centralaperture43. A diaphragm 44 made ofvery thin metal is clamped by the capl against 'the facel ofl the `nipples 40a andr 41 aperture45 for the passage of the fuel. The

deposit of matter in this aperture will-bey great-lyhindered,v ifno-tl totally impossibilitated', owing to the thinness ofl the dia.- phragm and the vibrations occuring therein due to the passageoffl the fuel therethrough. The-pilot burner 4,1 is regulatedby means of a valve'46securelylmounted in the extension 47"'provided' on the standard. This valveis composedfof'a stem 48'terminatingwith the point-ed end"49' engaging the short' duct 50;y

this.' stem i's'providedV intermediate its ends with tlie-threadedi portions 51 and thecollarl y slidihglv fitting within the counter-bored aperture '53. The'spindle is threaded into thevalve casing'54.' the outer end of which isty counterebore'd tofiprovide` roo-m for the valve'packing and the valve" glandv follower 56'. The packing-is compressed by means-'ofthe-interiorly threaded `cap 57 engaging corresponding threads provided on7 the casing: The valve stem is also-fittedwith a'handle58 which is securely mounted" thereonl after the stem has'been` inserted through its casing;-v

The? main burner'40 is without individual l vaflveffandthe 'flow' ofrfuel therethrough regulated-either by valve' 11 or 12 according tyfwhethertlie bnrneris operated with liquidx or gaseous fuel. The main duct 13 is plugged at its upper end by the screw 59I acting upon a sealing 'plug 60, generally made of lead.

The passage of thefuel from thetank to the main burner will remain:uninterrupted whether or not the valve ofv t-hepilotburner be closed, owing to the enlarged aperture 53 surrounding` the valve stem adjacent the point thereof:

The pilot burner is enclosed by a casing .t 61 depending` from the perforated flame tube 62 and communicating therewith through the aperture 68, generally provided with a wiremesh Screen 64 to preventthe entrance of foreign matter within the casing 61. ln the `present construction the flame tube and' the casing` are made integral andthe casing is suitably turned to engage a correspondingl bead 65a turned upon the extension 65 formed upon the standard. Suitable screwsv VSO (not shown in the drawing)y are providedto v securely hold flame tube andcasing tothe standard. Y

The torch is supplied,4 as usual7` vwith a handle 'which is secured to thertank in any suitable manner, such asby means 'of4 the straps -67 'and @Si surrounding thel tank and securely clamped -thereonby means of the screws 69; The principal parts of my torch` havingbeen described', the operation-'thereof` will be readily understood and'is asfollows: To fill the blowtorch with fuel*7 the wingcap 31 is removed and thetorchlis connected,`

while infupright position; with va `storztge' pressure tank? containing vthe fuel'. The created by thefuel7 will' then lift' thefill-ingvalve 25' andthe fuel 'will enter the tank thwrppugh the lateral apertures 30 provided in the' valveecage. The supply?of'fuelisv -di`s` continued after the liqui'd'h'as reachedia'level slightly below the bent "tube 34;@ This-` is as-` certained by opening the test'valvef and 'ob` serving the state of the fuel escaping theren through. An escape* ofl liquid fuelwillIv indicate that "the, latter has reached too highy a level' inlth-e torch-tank whereas a gaseous escape is indicative of the fact that the fuel is still'below the level ofthe bent tube.v

To operate l the torch with liquid fuel; for instance, the pilot valve 4G and the valveill are opened; the pressure in thestorage tank will then force; the properly 'strained tfue'l through the tube 16 the duct 14 and then to the pilot burner 41 and the main burner 40.,

The fuel flowing through the main burner now ignitedib'y 'applying a lighted' matchgvfor. instance, near the perforations 62L or 62", provided Vin the flame tube,v and thefia'meis transmittedv to the pilot 'burner, through lthe hol`e63.' y

As already/stated, the main 'burner may he operated'when the 'pilotburner is shutoff; but it is not possible in thi'storch to, operate. the pilot burner vsinglyv The principal obl jects of the latter are to insure a perfect Vaporization of the fuel issuing from the main burner and to prevent the extinction of the flame thereof in Windy places. This latter result is due to the protection afforded the pilot flame Within the enclosed casing 61.

The operation of the torch with gaseous fuel is effected identically as described for liquid fuel; the only difference being that the gaseous fuel valve 12 s opened instead of the valve ll.

It Will be understood, of course, that the arrangement I have'herein shown is merely suggestive of many that might be adopted in f carrying out my invention, and I do not Wish to be limited to the construction illustrated, otherwise than as specified inthe appended claim.

What I claim is:

In a torch, the combination of a plurality of burners of the character described; a test- Valve; a tube connecting said test-valve with the tank of said torch; an upward bend provided at the lower end of said tube, and a iilling-valve positioned centrally of tne bottom of said torch.

In testimony whereof I aliix my signature.

JAMES B. ANDERSON. i 

